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Friday, May 9, 2008

Cold Water Thrown on Antarctic Global-Warming PredictionsAntarctica hasn't warmed as much over the last century as climate models had originally predicted, a new study finds.

Climate change's effects on Antarctica are of particular interest because of the substantial amount of water locked up in its ice sheets.

Should that water begin to melt, sea levels around the globe could rise and inundate low-lying coastal areas.

The new study, detailed in the April 5 issue of the journal Geophysical Research Letters, marks the first time that researchers have been able to give a progress report on Antarctic climate model projections by comparing climate records to model simulations. (These comparisons have already been done for the other six continents.)

Information about Antarctica's harsh weather patterns has traditionally been limited, but temperature records from ice cores and ground weather stations have recently been constructed, giving scientists the missing information they needed.

"This is a really important exercise for these climate models," said study leader Andrew Monaghan of the National Center for Atmospheric Research in Boulder, Co.

Temperature gap

Monaghan and his team found that while climate models projected temperature increases of 1.4 degrees Fahrenheit (0.75 degrees Celsius) over the past century, temperatures were observed to have risen by only 0.4 F (0.2 C).

"This is showing us that, over the past century, most of Antarctica has not undergone the fairly dramatic warming that has affected the rest of the globe," Monaghan said.

The gap between prediction and reality seemed to be caused by the models overestimating the amount of water vapor in the Antarctic atmosphere.

The cold air over the southernmost continent handles moisture differently than the atmosphere over warmer regions.

The models did, however, correctly capture the increases in snowfall over Antarctica in the late 20th century, followed by a decrease in the last decade.

One reason that Antarctica hasn't warmed as much as other parts of the globe is the existence of the man-made ozone hole overhead: It alters wind patterns, creating a swirling belt of winds around the landmass that keeps comparatively warm air from seeping in, preserving the continent's frigid temperatures.

One important exception to this rule is the Antarctic Peninsula, which has warmed by several degrees, in part because winds there draw in warmer air from the north.

Mixed verdict

The Intergovernmental Panel on Climate Change has estimated that sea levels could rise by 7 to 23 inches (18 to 59 centimeters) globally this century, in part due to ice melt at both poles and from mountain glaciers.

The new study, funded by the National Science Foundation and the U.S. Department of Energy, suggests that warming in Antarctica could offset this amount by about 2 inches (5 centimeters) if the continent warms by 5.4 F (3 C), as warmer air would hold more moisture and generate more snowfall, which contributes to the growth of the ice sheets, locking up any additional water in the these large masses of ice.

That would mean a rise of only 5 to 21 inches (13 to 54 centimeters).

But these projections are by no means certain — if melt from Antarctic ice sheets outweighed the snowfall that contributes to their growth, sea level rise could be higher.

"The research clearly shows that you can actually slow down sea-level rise when you increase temperatures over Antarctica because snowfall increases, but warmer temperatures also have the potential to speed up sea-level rise due to enhanced melting along the edges of Antarctica," Monaghan said. "Over the next century, whether the ice sheet grows from increased snowfall or shrinks due to more melt will depend on how much temperatures increase in Antarctica, and potentially on erosion at the ice sheet edge by the warmer ocean and rising sea level."

The findings of the study don't call into question model projections for other parts of the globe, Monaghan said.

"The models are really doing quite a good job at simulating the 20th-century changes over the six inhabited continents," he told LiveScience.

Posted by
Mike Venetian

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My Rant

The claim that climate change is direct result of man's energy consumption is simply unproven and politically motivated. While they propound lies that certain lightbulbs or cars will destroy the earth and raise ocean levels as much as 20 feet within the next century, fascists, like Al Gore, fly around in their Gulfstream jets and live in homes that use 22 times the energy of an average American's home! Their propaganda is outrageous and potentially catastrophic for the economies of United States, the developed world and developing world.

The proof of global warming or man's influence on climate change is not settled science. Just consider the source of the big lie: the proselytizing hypocritical high priest of the pagan environmental religion Al Gore or the other Kool-Aid drinking climateers from the left such as Learjet liberals, Hollywood high school drop-outs, billonaire elitists, the left-leaning mainstream media, the United Nations, academia, environmental radicals, socialists, other anti-capitalists and so called "researchers", "experts" and/or "scientists" whose paychecks depend upon the apparent existence of the "issue".

United States energy conservation and independence is a worthy goal that should be supported by Republicans, the Democrat Party, true Democrats, Independents and environmentalists. Energy independence is a major national security concern. However, lying to our people, implementing the cap & trade boondoggle which will crush our economy or doing anything that will cause the United States to transfer an portion of its sovereignty to the United Nations is idiotic. Not in my name!